OK. Im pretty knowledgeable about computers and such, thats what I go to school for. However, when it comes to TBI, I payed verry little attention, espically how easy (or not) it is to swap. A guy came into work and asked if id swap TBI on to his blazer. I thought id do some research before I took on the job. So I turn to my fellow CK5 brothers!! He has a 72 blazer with a 406 small block and hes getting the TBI setup off a 87 blazer with a 350. Throttle body, Comp, harness, dist, no fuel pump. Heres my questions. 1. Will the stock harness work? Or is it more like the harness out of the cars with TPI, which just dont work? 2. Since it has a 406, this wont work, correct? The injectors will be too small, the comp will think its a 350, no good. Would it need a new chip? 3. He said hed get a 4 to 2 BBL adapter for the Throttle body. Besides changing Dist, O2, fuel pump and ect. Is it pretty easy? (Sounds less time comsuming then TPI). If the stock harness wont work is it better to get an stand alone harness, like from Painless? I am not trying to make this my headache, so all help and info is GREATLY APPRECIATED, like always. Thanks in advance!